3d display apparatus and method thereof

ABSTRACT

A Three-Dimensional (3D) display method is provided, and includes displaying a 3D screen including a plurality of objects having different depth perceptions, and displaying the 3D screen with a unified depth perception through adjustment of the depth perceptions of the plurality of objects to one depth perception, when a 3D display apparatus moves to a first state. Accordingly, it is possible to effectively control the operation of the display apparatus while viewing the 3D screen.

PRIORITY

This application claims priority under 35 U.S.C. §119(a) to KoreanPatent Application No. 10-2012-0003352, which was filed in the KoreanIntellectual Property Office on Jan. 11, 2012, the content of which isincorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to a Three-Dimensional (3D)display apparatus and a method thereof, and more particularly to a 3Ddisplay apparatus and a method that can change a screen display statedepending on the rotating state of the 3D display apparatus.

2. Description of the Related Art

With the development of electronic technology, various types ofelectronic devices have been developed and spread. In particular, typesof display devices, such as a Television (TV), a mobile phone, aPersonal Computer (PC), a notebook PC, and a Personal Data Assistant(PDA), have been widely used even in private homes.

As the use of display devices is increased, user needs for more diversefunctions have increased. In order to meet such user needs, respectivemanufacturers have successively developed products having new functions.

Therefore, devices having 3D display functions have recentlyproliferated. Such devices may be implemented by devices such as a 3D TVused in homes and in devices such as a 3D television receiver, monitors,a mobile phone, a PDA, a set top PC, a tablet PC, a digital photo frame,and a kiosk. Further, 3D display technology may be used in diversefields that require 3D imaging, such as science, medicine, design,education, advertisement, and computer games.

In a 3D display apparatus, a screen that includes a plurality of objectshaving different depth perceptions is displayed. A user perceives the 3Deffect due to a difference in depth perception between respectiveobjects. However, when a user intends to control the operation of the 3Ddisplay apparatus, the user may require a 3D screen. That is, varioustypes of menus, which are displayed on the screen to control theoperation of the 3D display apparatus, may visually conflict with theobjects that are displayed in 3D on the screen. Further, the menus maybe hidden by the objects being displayed or the objects may be hidden bythe menus being displayed on the screen to cause the menu selection andoperation to be difficult.

SUMMARY OF THE INVENTION

The present invention has been made to address at least the aboveproblems and/or disadvantages and to provide at least the advantagesdescribed below.

Accordingly, an aspect of the present invention provides a 3D displayapparatus and a method thereof, which can adjust the depth perceptionsof objects displayed on a screen if the apparatus is rotated while a 3Ddisplay is performed.

According to one aspect of the present invention, a 3D display method ina 3D display apparatus includes displaying a 3D screen including aplurality of objects having different depth perceptions, and displayingthe 3D screen with a unified depth perception through adjustment of thedepth perceptions of the plurality of objects to one depth perception ifthe 3D display apparatus moves to a first state.

According to another aspect of the present invention, a 3D displayapparatus includes a display unit displaying a 3D screen including aplurality of objects having different depth perceptions, a sensing unitsensing a movement state of the 3D display device, and a control unitcontrolling the display unit to display the 3D screen with a unifieddepth perception through adjustment of the depth perceptions of theplurality of objects to one depth perception if the 3D display apparatusmoves to a first state.

According to embodiments of the present invention, the screen displaystate is changed depending on the rotating state of the 3D displayapparatus, and thus the user can control the operation of the 3D displayapparatus more conveniently and easily.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of the presentinvention will be more apparent from the following detailed descriptionwhen taken in conjunction with the accompanying drawings, in which:

FIG. 1 illustrates the configuration of a 3D display apparatus accordingto an embodiment of the present invention;

FIGS. 2 to 6 illustrate a 3D display method in a 3D display apparatusaccording to embodiments of the present invention; and

FIGS. 7 and 8 illustrate a 3D display method according to diverseembodiments of the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Various embodiments of the present invention will now be described indetail with reference to the accompanying drawings. In the followingdescription, specific details such as detailed configuration andcomponents are merely provided to assist the overall understanding ofthese embodiments of the present invention. Therefore, it should beapparent to those skilled in the art that various changes andmodifications of the embodiments described herein can be made withoutdeparting from the scope and spirit of the present invention. Inaddition, descriptions of well-known functions and constructions areomitted for clarity and conciseness.

FIG. 1 illustrates the configuration of a 3D display apparatus accordingto an embodiment of the present invention. A 3D display apparatusaccording to an embodiment of the present invention may be implementedby a device having mobility, such as a mobile phone, a PDA, a tablet PC,an electronic book, or a digital photo frame.

Referring to FIG. 1, the display unit 110 displays a 3D screen includinga plurality of objects having different depth perceptions. The 3D screenmeans a screen which displays, in a 3D method, content provided from astorage device (not illustrated) that is provided in or connected to the3D display apparatus 100, various types of recording medium reproductiondevices (not illustrated) connected to the 3D display apparatus 100, oran external source (not illustrated) such as a broadcasting station or aweb server. Examples of the 3D screen may include a broadcasting programscreen, a multimedia content reproduction screen, an applicationexecution screen, and a web page screen. The application executionscreen means a screen that is provided when an application installed inthe 3D display apparatus 100 or the external device is executed.

The display unit 110 may be driven in manners depending on the 3Ddisplay method. That is, the 3D display method may be divided into aglasses type and a non-glasses type depending on whether 3D glasses areworn. The glasses type 3D display method may be further divided into ashutter glass type and a polarization type.

The shutter glass type 3D display method is a method in which asynchronization signal is transmitted to the 3D glasses so that aleft-eye shutter glass and a right-eye shutter glass are alternatelyopened at a corresponding image output time while a left-eye image and aright-eye image are alternately displayed through the display unit 110.When the shutter glass type 3D display method is performed, the displayunit 110 alternately displays the left-eye image and the right-eyeimage. The left-eye image and the right-eye image mean image framesconfigured so that the same objects are spaced apart from each other tohave disparities corresponding to the depth perceptions of the objects.For example, if object 1 displayed in the left-eye image and object 1displayed in the right-eye image are spaced apart from each other fordisparity 1, and if object 2 displayed in the left-eye image and object2 displayed in the right-eye image are spaced apart from each other fordisparity 2, the depth perceptions of object 1 and object 2 becomedifferent from each other.

The polarization type 3D image display method is a method in which aleft-eye image and a right-eye image are divided for each line, and thedivided left-eye image line and right-eye image line are alternatelyarranged to generate and output at least one image frame. In this case,the display unit 110 causes the respective lines have differentpolarization directions by using a polarizing film attached to a panel.The 3D glasses that a user wears have the left-eye glass and theright-eye glass that transmit lights having different polarizationdirections. Accordingly, the left-eye image line is only recognized bythe left eye, and the right-eye image line is recognized only by theright eye, so that a viewer can feel the 3D effect corresponding to theobject disparity between the left-eye image and the right-eye image. Inthe case of the non-glass type 3D image display method, the display unit110 includes a lenticular lens array or a parallax barrier. The displayunit 110 divides the left-eye image and the right-eye image for eachline and alternately arranges the respective lines to form and displayat least one image frame. The light for each line of the image frame isdispersed to a plurality of viewing areas by the lenticular lens arrayor the parallax barrier. The respective viewing areas may be formed atan interval of about 65 mm that is the binocular disparity of a human.

The left-eye image and the right-eye image may form a 3D image ofbroadcasting content or multimedia reproduction content, or a 3D imagethat includes types of User Interface (UI) windows or objects, such aswidget, image, and text.

The sensing unit 130 senses the motion state of the 3D display apparatus100. The motion states include states to which the 3D display apparatuscan move, such as an inclined state, a rotating state, and a movementstate. The sensing unit 130 may include a geomagnetic sensor, a gyrosensor, and an acceleration sensor. Accordingly, the sensing unit 130can sense whether the 3D display apparatus 100 is placed in the verticaldirection or in the horizontal direction, or whether the 3D displayapparatus 100 is in the horizontal state or in an inclined state,through measurement of a rotating angle, a pitch angle, a yaw angle, anda roll angel of the 3D display apparatus 100.

The sensing unit 130 may be implemented to include at least one of thetypes of sensors as described above, and its sensing method may differdepending on the type of the sensor. For example, when the sensing unitis provided with a two-axis fluxgate geomagnetic sensor, the sensingunit measures the size and direction of an external magnetic fieldthrough sensing the size of an electrical signal of the two-axisfluxgate that is changed depending on the rotating state thereof Sincethe output values detected from the respective fluxgates is affected bythe inclination, the pitch angle, the roll angle, and the yaw angle ofthe 3D display apparatus 100 may be calculated using the output values.If the pitch angle and the roll angle become “0”, the sensing unit 130determines that the 3D display apparatus 100 is placed in the horizontalstate based on the ground surface, while if the pitch angle and the rollangle become 90 degrees, the sensing unit 130 determines that the 3Ddisplay apparatus 100 is put upright in the vertical or horizontaldirection. The sensing unit 130 can also determine the rotatingdirection of the 3D display apparatus according to the size and sign ofthe yaw angle. These values may differ depending on the direction of thesensor put in the 3D display apparatus 100.

In addition, the sensing unit 130 may adopt types of sensors that areknown in the art, and the detailed description and illustration thereofwill be omitted.

The control unit 120 controls the operation of the display unit 110depending on the result of the sensing by the sensing unit 130.Specifically, if it is sensed that the 3D display apparatus 100 moves tothe first state, the control unit 120 may control the display unit 110to unify the depth perceptions of the respective objects that are beingdisplayed through the display unit 110 into one depth perception.

The display unit 110 may unify the depth perceptions by adjusting thedisparity through shifting the positions of the objects displayed in theleft-eye image and the right-eye image for forming the 3D screen.

Further, according to an embodiment of the present invention, the firststate may be defined in several manners. For example, the first statemay be a horizontal state in which the 3D display apparatus 100 ishorizontally put on the ground surface, a state in which the 3D displayapparatus 100 is rotated in a horizontal or vertical direction, a statein which the 3D display apparatus 100 is inclined over a predeterminedinclination, a state in which the 3D display apparatus 100 is rotatedover a predetermined rotating angle, a state in which the 3D displayapparatus 100 moves toward or away from the user side while maintainingthe inclination, or a state in which the 3D display apparatus 100 ismoving to form a specified pattern. In the description, it is assumedthat the horizontal state is defined as the first state.

FIG. 2 illustrates the operation of a 3D display apparatus according toan embodiment of the present invention. Referring to FIG. 2, the 3Ddisplay apparatus 100 displays a 3D screen 10 in a state in which the 3Ddisplay apparatus 100 is inclined at a predetermined inclination basedon the horizontal surface. On the 3D screen 10, a plurality of objectsOb1, Ob2, and Ob3 having different depth perceptions are displayed. Thedepth perceptions of the respective objects Ob1, Ob2, and Ob3 aredenoted by D0, D1, and D2. D0 denotes the depth feeling whichcorresponds to the same plane as the screen of the 3D display apparatus100, D1 denotes the depth feeling which corresponds to a plane thatprojects for a predetermined distance from the screen in a userdirection, and D2 denotes the depth perception which corresponds to aplane that projects further from D1.

If the 3D display apparatus 100 is rotated in a state in which the 3Dscreen 10 that includes the respective objects Ob1, Ob2, and Ob3 isdisplayed, the depth perceptions of the respective objects Ob1, Ob2, andOb3 are adjusted to be unified into one depth perception. That is, asshown in FIG. 2, the depth perceptions of the objects are unified intoD1. Although it is shown that the depth perceptions of the objects areunified into D1 in FIG. 2, the depth perceptions of the objects may alsobe unified into D2 or another depth perception through which the 3Ddisplay state can be recognized. Further, although it is shown that thedepth perceptions of the objects are unified into one depth perceptionin FIG. 2, it is also possible to unify the depth perceptions of theobjects are unified into about two depth perceptions. For example, whenobjects having six depth perceptions, such as D0 to D5, are displayed,the depth perceptions D0, D1, and D2 may be unified into D1, and thedepth perceptions D3, D4, and D5 may be unified into D2 to be displayed.

Although it is shown that only the depth perceptions are adjusteddepending on the motion of the 3D display apparatus 100 in FIG. 2, thescreen configuration may be changed simultaneously with the adjustmentof the depth perceptions.

Referring to FIG. 3, if the 3D display apparatus 100 is rotated to thehorizontal state while displaying the 3D screen 10 that includes therespective objects Ob1, Ob2, and Ob3, the depth perceptions of theobjects Ob1, Ob2, and Ob3 are unified into D1, and a menu 20 for the 3Dscreen 10 is displayed. The menu 20 includes types of selection menus 21and 22 related to the 3D screen 10 currently displayed. The selectionmenu related to the 3D screen 10 indicates a menu that can be selectedto perform control, such as usage, adjustment, sharing, and edition,with respect to content. For example, if the 3D screen 10 is a contentreproduction screen, a reproduction or pause menu, a stop menu, afast-forward menu, a rewind menu, and a reproduction time display menu,may be included in the menu 20. As shown in FIG. 3, icons of types ofapplications related to the 3D screen 10 may be implemented through theselection menus 21 and 22.

FIG. 4 illustrates a 3D display method according to another embodimentof the present invention. Referring to FIG. 4, if the 3D displayapparatus is rotated to the horizontal state while displaying the 3Dscreen 10 that includes the respective objects Ob1, Ob2, and Ob3 havingthe different depth perceptions D0, D1, an D2, the depth perceptions ofthe objects Ob1, Ob2, and Ob3 are unified into one depth value, and thelayout of the 3D screen 10 is changed. The layout change may beperformed in manners according to embodiments of the present invention.That is, the respective objects Ob1, Ob2, and Ob3 that are dispersed atarbitrary positions may be regularly arranged for display. However, thedistances among the respective objects Ob1, Ob2, and Ob3 or their sizesor shapes, may be constantly unified. FIG. 4 shows the instance when thedistances among the respective objects Ob1, Ob2, and Ob3 are unified.Before the 3D screen 10 is rotated, the respective objects Ob1, Ob2, andOb3 have different distances s1, s2, and s3, but after the 3D screen 10is rotated, the layout is changed so that the objects have the samedistance s3.

Such layout change may be selectively performed depending on the typesof content displayed on the 3D screen 10. That is, the distances forgeneral objects, as shown in FIG. 4, may be adjusted or other featureelements, such as the shapes and sizes, may be adjusted. However, forobjects included in multimedia content, such as movie or broadcastingcontent, and photo content, the layout change may not be performed.

The above-described layout change may be differently applied dependingon the types of content. That is, if there are objects present thatbelong to the same type, such as a plurality of images or menu icons,the layout may be changed so that the distances, sizes, and shapes ofthe objects coincide with one another for each type. By contrast, if aplurality of objects having different types is present, the layout maybe change so that the objects are grouped for each type.

When the distances among the objects are unified as shown in FIG. 4, theminimum distance among the distances s1, s2, and s3 of the respectiveobjects may be set as the unified distance. Another default value may beset as the unified distance.

As shown in FIGS. 2 to 4, if the 3D display apparatus 100 moves to thefirst state to achieve the depth perception adjustment, and then movesto the original state, the unified depth perception is adjusted toreturn to the original depth perceptions.

In particular, if the 3D display apparatus 100 moves to the originalstate after the menu display or the layout change is performed as shownin FIGS. 3 and 4, the menu display may be removed, and the layout may bechanged to the original state.

In the embodiments illustrated in FIGS. 3 and 4, it is shown that themenu display or the layout change is performed together with the depthperception unification through the movement of the 3D display apparatus100 to the first state. However, such operations may be performedthrough different motions separately from the depth perceptionunification operation. These embodiments will be described withreference to FIGS. 5 and 6.

FIG. 5 illustrates a 3D display method according to another embodimentof the present invention. Referring to FIG. 5, if the 3D displayapparatus 100 is rotated to a second state in a state in which the 3Dscreen 10 that includes the plurality of objects Ob1, Ob2, and Ob3having different depth perceptions D1, D2, and D3 is displayed, a menu20 is displayed on the 3D screen 10 while the depth perceptions of therespective objects Ob1, Ob2, and Ob3 are maintained. Although FIG. 5shows that the second state is a state in which the 3D display apparatus100 is rotated counterclockwise, the second state is not limitedthereto. That is, the second state may include a state in which the 3Ddisplay apparatus 100 is rotated clockwise and a state in which the 3Ddisplay apparatus 100 is inclined to the front side or the rear side.Further, although FIG. 5 shows that the 3D display apparatus 100 is putin the horizontal direction to be used and then is turned in thevertical direction, the menu 20 may be displayed even instance when the3D display apparatus 100 is turned from the vertical direction to thehorizontal direction according to the embodiment of the presentinvention.

If the 3D display apparatus 100 is rotated to the first state in a statein which the 3D display apparatus 100 is rotated to the second state andthe menu 20 is displayed, the depth perceptions of the respectiveobjects Ob1, Ob2, and Ob3 are unified into one depth perception in astate in which the menu 20 is displayed. FIG. 5 shows the state in whichthe depth perceptions are unified into D1. As described above, the usercan operate the menu 20 without being visually affected with respect tothe 3D screen.

FIG. 6 illustrates a 3D display method according to still anotherembodiment of the present invention. Referring to FIG. 6, if the 3Ddisplay apparatus 100 is rotated to the second state in a state in whichthe 3D screen 10 that includes the plurality of objects Ob1, Ob2, andOb3 having different depth perceptions D1, D2, and D3 is displayed, thelayout of the 3D screen 10 is changed while the depth perceptions of therespective objects Ob1, Ob2, and Ob3 are maintained. Accordingly, therespective objects Ob1, Ob2, and Ob3 having different distances s1 ands2 are arranged so that they have a constant distance such as s3.

If the 3D display apparatus 100 moves to the first state in theabove-described state, the depth perceptions of the respective objectsOb1, Ob2, and Ob3 are unified into one depth perception in a state inwhich the layout of the 3D screen 10 is changed. FIG. 6 shows the statein which the depth perceptions are unified into D1.

Although FIGS. 5 and 6 show that the 3D display apparatus 100 moves tothe second state and then moves to the first state, the 3D displayapparatus 100 may first move to the first state and then moves to thesecond state. In this case, the depth perception adjustment is firstperformed, and then the menu display or the layout change is performedwhen the 3D display apparatus 100 moves to the second state.

Further, even in the embodiments shown in FIGS. 5 and 6, if the 3Ddisplay apparatus 100 moves to the previous state or to the originalstate, the screen display state may return to the previous state or theoriginal state.

The types of 3D display methods as shown in FIGS. 2 to 6 may beperformed through the 3D display apparatus 100 having the configurationas shown in FIG. 1. Although FIG. 1 illustrates the essentialconfiguration to execute the various types of 3D display methods, aninterface for connecting to an external server or device, a storage unitfor storing various types of content, programs, and data, a keypad, anda touch screen, may be additionally configured.

FIG. 7 illustrates a 3D display method according to an embodiment of thepresent invention.

Referring to FIG. 7, if it is sensed that the 3D display apparatus movesto the first state in step S720 in a state in which the 3D screenincluding at least one object is displayed in step S710, the depthperceptions of the objects that are displayed on the 3D screen areadjusted to be unified into one depth perception in step S730.Accordingly, the user can stably control the operation of the 3D displayapparatus.

According to the embodiments of the present invention, the menu may bedisplayed along with the depth perception adjustment as shown in FIG. 3,or the layout may be changed as shown in FIG. 4.

FIG. 8 illustrates a 3D display method according to another embodimentof the present invention.

Referring to FIG. 8, if the 3D display apparatus moves to the firststate in step S815 in a state in which the 3D screen including at leastone object is displayed in step S810, the depth perceptions of theobjects are adjusted to be unified into one depth perception in stepS820.

If the 3D display apparatus moves in the opposite direction and returnsto the original state in the above-described state in step S825, thedepth perception is readjusted to the original state in step S830.

If the 3D display apparatus is rotated to the second state in step S835,the screen display state is changed in step S840. Specifically, thechange of the screen display state may be a process of additionallydisplaying a menu on the 3D screen or a process of changing the layoutthrough rearrangement of the objects on the 3D screen.

If the 3D display apparatus returns from the second state to theprevious state in step S845, the screen display state is readjusted tothe previous state in step S850. These steps are performed until the 3Ddisplay is finished in step S855. Although FIG. 8 illustrates that therotation of the 3D display apparatus to the second state is performedafter the 3D display apparatus is rotated to the first state, the orderof performing the above-described steps is not limited.

As described above, the first state and the second state may be definedas states, and the layout may also be changed in diverse manners.

A program for performing the methods according to embodiments of thepresent invention as described above may be stored in various types ofrecording media.

Specifically, such a program may be stored in various types of recordingmedia that can be read by a terminal, such as a RAM (Random AccessMemory), a flash memory, a ROM (Read Only Memory), an EPROM (ErasableProgrammable ROM), an EEPROM (Electronically Erasable and ProgrammableROM), a register, a hard disk, a removable disk, a memory card, aUniversal Serial Bus (USB) memory, and a CD-ROM.

While the present invention has been shown and described with referenceto certain embodiments thereof, it will be understood by those skilledin the art that changes in form and detail may be made therein withoutdeparting from the spirit and scope of the present invention, as definedby the appended claims.

What is claimed is:
 1. A Three-Dimensional (3D) display method in a 3Ddisplay apparatus comprising: displaying a 3D screen including aplurality of objects having different depth perceptions; and displaying,when the 3D display apparatus moves to a first state, the 3D screen witha unified depth perception through adjustment of the depth perceptionsof the plurality of objects to one depth perception.
 2. The 3D displaymethod as claimed in claim 1, wherein displaying the 3D screen with theunified depth perception unifies the depth perceptions of the pluralityof objects into the one depth perception while additionally displaying amenu corresponding to the 3D screen on the 3D screen, when the 3Ddisplay apparatus moves to the first state.
 3. The 3D display method asclaimed in claim 1, wherein displaying the 3D screen with the unifieddepth perception unifies the depth perceptions of the plurality ofobjects into the one depth perception while changing a layout of the 3Dscreen so that the plurality of objects displayed on the 3D screen arearranged to be spaced apart from one another for a predetermineddistance, when the 3D display apparatus moves to the first state.
 4. The3D display method as claimed in claim 1, further comprising additionallydisplaying a menu corresponding to the 3D screen on the 3D screen, whenthe 3D display apparatus is rotated to a second state.
 5. The 3D displaymethod as claimed in claim 4, further comprising removing the menudisplayed on the 3D screen, when the 3D display apparatus returns fromthe second state to the previous state.
 6. The 3D display method asclaimed in claim 1, further comprising changing a layout of the 3Dscreen so that the plurality of objects displayed on the 3D screen arearranged to be spaced apart from one another for a predetermineddistance, when the 3D display apparatus is rotated to the second state.7. The 3D display method as claimed in claim 6, further comprisingchanging the layout of the 3D screen so that the plurality of objectsare rearranged to an original arrangement state, when the 3D displayapparatus returns from the second state to the previous state.
 8. The 3Ddisplay method as claimed in claim 4, wherein in the second state, thedisplay apparatus is rotated in a horizontal or vertical direction. 9.The 3D display method as claimed in claim 1, further comprisingadjusting the depth perceptions of the plurality of objects to theoriginal depth perceptions if the 3D display apparatus returns from thefirst state to the original state.
 10. The 3D display method as claimedin claim 9, wherein the first state is one of a horizontal state inwhich the 3D display apparatus is horizontally put on a ground surface,a state in which the 3D display apparatus is rotated in a horizontal orvertical direction, a state in which the 3D display apparatus isinclined over a predetermined inclination, a state in which the 3Ddisplay apparatus is rotated over a predetermined rotating angle, astate in which the 3D display apparatus moves toward or away from a userside while maintaining the inclination, and a state in which the 3Ddisplay apparatus moves to form a specified pattern.
 11. AThree-Dimensional (3D) display apparatus comprising: a display unitdisplaying a 3D screen including a plurality of objects having differentdepth perceptions; a sensing unit sensing a movement state of the 3Ddisplay device; and a control unit controlling the display unit todisplay the 3D screen with a unified depth feeling through adjustment ofthe depth perceptions of the plurality of objects to one depthperception, when the 3D display apparatus moves to a first state. 12.The 3D display apparatus as claimed in claim 11, wherein the controlunit controls the display unit to unify the depth perceptions of theplurality of objects into the one depth perception while additionallydisplaying a menu corresponding to the 3D screen on the 3D screen, whenthe 3D display apparatus moves to the first state.
 13. The 3D displayapparatus as claimed in claim 12, wherein the control unit controls thedisplay unit to unify the depth perceptions of the plurality of objectsinto the one depth perception while changing a layout of the 3D screenso that the plurality of objects displayed on the 3D screen are arrangedto be spaced apart from one another for a distance, when the 3D displayapparatus moves to the first state.
 14. The 3D display apparatus asclaimed in claim 11, wherein the control unit controls the display unitto additionally display a menu corresponding to the 3D screen on the 3Dscreen, when the 3D display apparatus is rotated to a second state. 15.The 3D display apparatus as claimed in claim 14, wherein the controlunit controls the display unit to remove the menu displayed on the 3Dscreen, when the 3D display apparatus returns from the second state tothe previous state.
 16. The 3D display apparatus as claimed in claim 11,wherein the control unit controls the display unit to change a layout ofthe 3D screen so that the plurality of objects displayed on the 3Dscreen are arranged to be spaced apart from one another for apredetermined distance, when the 3D display apparatus is rotated to thesecond state.
 17. The 3D display apparatus as claimed in claim 16,wherein the control unit controls the display unit to change the layoutof the 3D screen so that the plurality of objects are rearranged to anoriginal arrangement state, when the 3D display apparatus returns fromthe second state to the previous state.
 18. The 3D display apparatus asclaimed in claim 14, wherein in the second state, the display apparatusis rotated in a horizontal or vertical direction.
 19. The 3D displayapparatus as claimed in claim 11, wherein the control unit controls thedisplay unit to adjust the depth perceptions of the plurality of objectsto the original depth perceptions, when the 3D display apparatus returnsfrom the first state to the original state.
 20. The 3D display apparatusas claimed in claim 19, wherein the first state is one of a horizontalstate in which the 3D display apparatus is horizontally put on a groundsurface, a state in which the 3D display apparatus is rotated in ahorizontal or vertical direction, a state in which the 3D displayapparatus is inclined over a predetermined inclination, a state in whichthe 3D display apparatus is rotated over a predetermined rotating angle,a state in which the 3D display apparatus moves toward or away from auser side while maintaining the inclination, and a state in which the 3Ddisplay apparatus moves to form a specified pattern.